deep scattering layer
a layer in mid-depths of the sea detected by echo sounders, which rises at night and sinks during the day. Composed of organisms, many of which have a gas filled chamber, such as certain jellyfish and fishes. Also called false bottom. Abbreviated as DSL

Dictionary of ichthyology. 2009.

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  • deep scattering layer — n. any of the stratified zones in the ocean which reflect sound during echo sounding, usually composed of marine organisms which migrate vertically from c. 250 to 800 m ( c. 820 to 2,625 ft) …   English World dictionary

  • Deep scattering layer — The deep scattering layer, sometimes referred to as The Sound Scattering Layer ; is the name given to a layer in the ocean consisting of a variety of marine animals. It was discovered through the use of sonar, as ships found a layer that… …   Wikipedia

  • deep scattering layer — Oceanog. a zone of biological origin within the ocean, at a depth of 900 1200 ft. (270 360 m), which scatters sounding echoes. * * * deep scattering layer, microscopic marine organisms that form a layer deep in the ocean, causing a reflection of… …   Useful english dictionary

  • deep-scattering layer — ▪ oceanography       horizontal zone of living organisms, usually schools of fish, occurring below the surface in many ocean areas, so called because the layer scatters or reflects sound waves, causing echoes in depth sounders. Originally… …   Universalium

  • deep scattering layer — Oceanog. a zone of biological origin within the ocean, at a depth of 900 1200 ft. (270 360 m), which scatters sounding echoes. * * * …   Universalium

  • Deep sea fish — Humpback anglerfish Deep sea fish is a term for any fish that lives below the photic zone of the ocean. The lanternfish is, by far, the most common deep sea fish. Other deep sea fish include the flashlight fish, cookiecutter shark, bristlemouths …   Wikipedia

  • Helium atom scattering — (HAS) is a surface analysis technique used in materials science. HAS provides information about the surface structure and lattice dynamics of a material by measuring the diffracted atoms from a monochromatic helium beam incident on the sample.… …   Wikipedia

  • false bottom — deep scattering layer (a layer in mid depths of the sea detected by echo sounders, which rises at night and sinks during the day. Composed of organisms, many of which have a gas filled chamber, such as certain jellyfish and fishes) …   Dictionary of ichthyology

  • Pelagic fish — A school of large pelagic predator fish (giant trevally) sizing up a school of small pelagic prey fish (anchovies) Pelagic fish live near the surface or in the water column of coastal, ocean and lake waters, but not on the bottom of the sea or… …   Wikipedia

  • Underwater acoustics — The field of underwater acoustics is closely related to a number of other fields of acoustic study, including sonar, transduction, acoustic signal processing, acoustical oceanography, bioacoustics, and physical acoustics.HistoryUnderwater sound… …   Wikipedia

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